<template>
	<div class="wrapper">

		<!-- header部分 -->
		<header>
			<p>商家信息</p>
		</header>

		<!-- 商家logo部分 -->
		<div class="business-logo">
			<img :src="business.businessImg">
		</div>

		<!-- 商家信息部分 -->
		<div class="business-info">
			<h1>{{business.businessName}}</h1>
			<p>&#165;{{business.starPrice}}起送 &#165;{{business.deliveryPrice}}配送</p>
			<p>{{business.businessExplain}}</p>
		</div>

		<!-- 食品列表部分 -->
		<ul class="food">
			<li v-for="(item,index) in foodArr">
				<div class="food-left">
					<img :src="item.foodImg">
					<div class="food-left-info">
						<h3>{{item.foodName}}</h3>
						<p>{{item.foodExplain}}</p>
						<p>&#165;{{item.foodPrice}}</p>
					</div>
				</div>
				<div class="food-right">
					<div>
						<i class="fa fa-minus-circle" v-show="item.quantity>0" @click="minus(index)"></i>
					</div>
					<p><span v-show="item.quantity>0">{{item.quantity}}</span></p>
					<div>
						<i class="fa fa-plus-circle" @click="add(index)"></i>
					</div>
				</div>
			</li>
		</ul>

		<!-- 购物车部分 -->
		<div class="cart">
			<div class="cart-left">
				<div class="cart-left-icon" :style="totalQuantity==0?'background-color:#505051':'background-color:#3190E8'">
					<i class="fa fa-shopping-cart"></i>
					<div class="cart-left-icon-quantity" v-show="totalQuantity!=0">
						{{totalQuantity}}
					</div>
				</div>
				<div class="cart-left-info">
					<p>&#165;{{totalPrice}}</p>
					<p>另需配送费{{business.deliveryPrice}}元</p>
				</div>
			</div>
			<div class="cart-right">
				<!-- 不够起送费 -->
				<div class="cart-right-item" v-show="totalPrice<business.starPrice">
					&#165;{{business.starPrice}}起送
				</div>

				<!-- 达到起送费 -->
				<div class="cart-right-item" v-show="totalPrice>=business.starPrice" @click="toOrder">
					去结算
				</div>
			</div>
		</div>
	</div>


</template>

<script setup>
	import qs from 'qs';
	//导入路由相关的模块
	import {useRouter,useRoute} from 'vue-router';
	import {ref,inject,computed} from 'vue'
	import {getSessionStorage} from '../common.js'

	const axios = inject("axios");
	const router = useRouter();
	const route = useRoute();
	const businessId = route.query.businessId;
	//如果没取到就是空的，如果获取的user非空说明已经登录
	const user = getSessionStorage('user');
	//定义business用于接受通过businessId查询返回来的商家信息
	const business = ref({});
	//定义食品信息列表
	const foodArr = ref([]);

	//计算属性
	//食品总价格
	const totalPrice = computed(() => {
		let total = 0;
		for (let item of foodArr.value) {
			total += item.foodPrice * item.quantity;
		}
		console.log(total);
		return total;
	});

	//食品总数量
	const totalQuantity = computed(() => {
		let quantity = 0;
		for (let item of foodArr.value) {
			quantity += item.quantity;
		}
		console.log(quantity);
		return quantity;
	});

	//结算总价格
	const totalSettle = computed(() => {

		return totalPrice.value + business.value.deliveryPrice;

	});


	const init = () => {
		//根据businessId查询商家信息
		axios.post('BusinessController/getBusinessById', qs.stringify({
			businessId: businessId
		})).then((response) => {
			business.value = response.data;
			console.log(response.data);
		}).catch((error) => {
			console.log(error);
		});
		//根据businessId查询食品信息
		axios.post('FoodController/listFoodByBusinessId', qs.stringify({
			businessId: businessId
		})).then((response) => {
			let arr = response.data;
			console.log(arr);
			for (let i = 0; i < arr.length; i++) {
				//页面上每一个食品添加数量的属性，初始化的值为【0】
				arr[i].quantity = 0;
			}
			foodArr.value = arr;

			//如果用户已经登陆，那么需要去购物车查询选购了哪些食品
			if (user != null) {
				listCart();
			}
		}).catch((error) => {
			console.log(error);
		});
	};
	//初始化商家信息
	init();

	//点击[+]，触发的事件
	const add = (index) => {
		//首先要做登录验证
		if (user == null) {
			router.push({
				path: '/login'
			});
			return;
		}
		//模拟如果登录了，继续下面的业务流程
		console.log("========666========")

		//判断数量决定调用的方法
		if (foodArr.value[index].quantity == 0) {
			//insert
			saveCart(index);

		} else {
			//update
			updateCart(index, 1);
		}

	}

	//点击[-]，触发的事件
	const minus = (index) => {
		//首先要做登录验证
		if (user == null) {
			router.push({
				path: '/login'
			});
			return;
		}
		//判断数量决定调用的方法
		if (foodArr.value[index].quantity > 1) {
			//update
			updateCart(index, -1);
		} else {
			//delete
			removeCart(index);
		}
	}

	//插入一条数据
	const saveCart = (index) => {
		axios.post('CartController/saveCart', qs.stringify({
			//通过传过来的数组下标来获取对应对象的信息的foodId的值
			foodId: foodArr.value[index].foodId,
			businessId: businessId,
			userId: user.userId,
		})).then((response) => {
			console.log(response.data);
			//插入的数据条数为1,说明插入数据成功
			if (response.data == 1) {
				foodArr.value[index].quantity = 1;
			} else {
				alert("数据响应错误");
			}
		}).catch((error) => {
			console.log(error);
		});
	}

	//更新购物车的数量
	const updateCart = (index, num) => {
		axios.post('CartController/updateCart', qs.stringify({
			//通过传过来的数组下标来获取对应对象的信息的foodId的值
			foodId: foodArr.value[index].foodId,
			businessId: businessId,
			userId: user.userId,
			quantity: foodArr.value[index].quantity + num,
		})).then((response) => {
			console.log(response.data);
			//插入的数据条数为1,说明更新数据成功
			if (response.data == 1) {
				foodArr.value[index].quantity += num;
			} else {
				alert("添加失败");
			}
		}).catch((error) => {
			console.log(error);
		});
	}

	//删除一条数据
	const removeCart = (index) => {
		axios.post('CartController/removeCart', qs.stringify({
			//通过传过来的数组下标来获取对应对象的信息的foodId的值
			foodId: foodArr.value[index].foodId,
			businessId: businessId,
			userId: user.userId,
		})).then((response) => {
			console.log(response.data);
			//插入的数据条数为1,说明更新数据成功
			if (response.data == 1) {
				foodArr.value[index].quantity = 0;
			} else {
				alert("从购物车中移除商品失败！");
			}
		}).catch((error) => {
			console.log(error);
		});
	}

	//查询购物车信息
	const listCart = () => {
		axios.post('CartController/listCart', qs.stringify({
			businessId: businessId,
			userId: user.userId,
		})).then((response) => {
			console.log(response.data);
			//购物车的数据
			let cartArr = response.data;
			//foodArr.value食品列表的数据
			//1.先遍历所有的食品列表
			//2.循环遍历购物车
			//3.如果食品列表的id和购物车里的食品id相同或者相等，那么就把购物车的数量赋给食品列表
			for (let foodItem of foodArr.value) {
				foodItem.quantity = 0;
				for (let cartItem of cartArr) {
					if (cartItem.foodId == foodItem.foodId) {
						foodItem.quantity = cartItem.quantity;
					}
				}
			}
		}).catch((error) => {
			console.log(error);
		});
	}

	//路由到确认订单组件
	const toOrder = () => {
		router.push({
			path: "/orders",
			query: {
				businessId:businessId
			}
		});
	}
</script>

<style scoped>
	/****************** 总容器 ******************/
	.wrapper {
		width: 100%;
		height: 100%;
	}

	/****************** header部分 ******************/
	.wrapper header {
		width: 100%;
		height: 12vw;
		background-color: #0097FF;
		color: #fff;
		font-size: 4.8vw;

		position: fixed;
		left: 0;
		top: 0;
		z-index: 1000;

		display: flex;
		justify-content: center;
		align-items: center;
	}

	/****************** 商家logo部分 ******************/
	.wrapper .business-logo {
		width: 100%;
		height: 35vw;
		/*使用上外边距避开header部分*/
		margin-top: 12vw;

		display: flex;
		justify-content: center;
		align-items: center;
	}

	.wrapper .business-logo img {
		width: 40vw;
		height: 30vw;
		border-radius: 5px;
	}

	/****************** 商家信息部分 ******************/
	.wrapper .business-info {
		width: 100%;
		height: 20vw;

		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
	}

	.wrapper .business-info h1 {
		font-size: 5vw;
	}

	.wrapper .business-info p {
		font-size: 3vw;
		color: #666;
		margin-top: 1vw;
	}

	/****************** 食品列表部分 ******************/
	.wrapper .food {
		width: 100%;
		/*使用下外边距避开footer部分*/
		margin-bottom: 14vw;
	}

	.wrapper .food li {
		width: 100%;
		box-sizing: border-box;
		padding: 2.5vw;
		user-select: none;

		display: flex;
		justify-content: space-between;
		align-items: center;
	}

	.wrapper .food li .food-left {
		display: flex;
		align-items: center;
	}

	.wrapper .food li .food-left img {
		width: 20vw;
		height: 20vw;
	}

	.wrapper .food li .food-left .food-left-info {
		margin-left: 3vw;
	}

	.wrapper .food li .food-left .food-left-info h3 {
		font-size: 3.8vw;
		color: #555;
	}

	.wrapper .food li .food-left .food-left-info p {
		font-size: 3vw;
		color: #888;
		margin-top: 2vw;
	}

	.wrapper .food li .food-right {
		width: 16vw;
		display: flex;
		justify-content: space-between;
		align-items: center;
	}

	.wrapper .food li .food-right .fa-minus-circle {
		font-size: 5.5vw;
		color: #999;
		cursor: pointer;
	}

	.wrapper .food li .food-right p {
		font-size: 3.6vw;
		color: #333;
	}

	.wrapper .food li .food-right .fa-plus-circle {
		font-size: 5.5vw;
		color: #0097EF;
		cursor: pointer;
	}

	/****************** 购物车部分 ******************/
	.wrapper .cart {
		width: 100%;
		height: 14vw;

		position: fixed;
		left: 0;
		bottom: 0;

		display: flex;
	}

	.wrapper .cart .cart-left {
		flex: 2;
		background-color: #505051;
		display: flex;
	}

	.wrapper .cart .cart-left .cart-left-icon {
		width: 16vw;
		height: 16vw;
		box-sizing: border-box;
		border: solid 1.6vw #444;
		border-radius: 8vw;
		background-color: #3190E8;
		font-size: 7vw;
		color: #fff;

		display: flex;
		justify-content: center;
		align-items: center;

		margin-top: -4vw;
		margin-left: 3vw;

		position: relative;
	}

	.wrapper .cart .cart-left .cart-left-icon-quantity {
		width: 5vw;
		height: 5vw;
		border-radius: 2.5vw;
		background-color: red;
		color: #fff;
		font-size: 3.6vw;

		display: flex;
		justify-content: center;
		align-items: center;

		position: absolute;
		right: -1.5vw;
		top: -1.5vw;
	}

	.wrapper .cart .cart-left .cart-left-info p:first-child {
		font-size: 4.5vw;
		color: #fff;
		margin-top: 1vw;
	}

	.wrapper .cart .cart-left .cart-left-info p:last-child {
		font-size: 2.8vw;
		color: #AAA;
	}

	.wrapper .cart .cart-right {
		flex: 1;
	}

	/*达到起送费时的样式*/
	.wrapper .cart .cart-right .cart-right-item {
		width: 100%;
		height: 100%;
		background-color: #38CA73;
		color: #fff;
		font-size: 4.5vw;
		font-weight: 700;
		user-select: none;
		cursor: pointer;

		display: flex;
		justify-content: center;
		align-items: center;
	}

	/*不够起送费时的样式（只有背景色和鼠标样式的区别）*/
	/*
.wrapper .cart .cart-right .cart-right-item{
	width: 100%;
	height: 100%;
	background-color: #535356;
	color: #fff;
	font-size: 4.5vw;
	font-weight: 700;
	user-select: none;
	
	display: flex;
	justify-content: center;
	align-items: center;
}
*/
</style>
